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Water Sensor


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15 replies to this topic

#1 Guest_yogionekanobee_*

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Posted 09 September 2005 - 08:50 AM

Hi, Can anyone suggest a water sensor that can detect an overflow / flood that would be compatible with the labJack? Many thanks

#2 LabJack Support

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Posted 09 September 2005 - 09:12 AM

Here is the first one I found on Google. The CND-2800 for $12 from liquidlevel.com:

http://www.liquidlev..._CND-Series.asp

I believe you would connect 5 volts from the LabJack to the red wire. Then connect the black wire to a digital input. You would then put a resistor (perhaps 4.7k) from the digital input to GND. You should probably contact the manufacturer to confirm this.

#3 LabJack Support

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Posted 09 September 2005 - 09:17 AM

They have a $50 minimum order, so we ordered one from homesecuritystore.com instead to try out ourselves:

http://homesecuritys...p?productID=608

#4 Guest_yogionekanobee_*

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Posted 09 September 2005 - 11:18 AM

Thanks for that - let us know if it works OK.

#5 Frosty

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Posted 10 September 2005 - 03:10 PM

Or even cheaper try one of these very simple moisture sensors between the 5 volt output and one of the inputs.

#6 LabJack Support

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Posted 19 September 2005 - 03:50 PM

Using the 2800 - Water Sensor Switch available from homesecuritystore.com we hooked it up to a LabJack as described in an earlier post. Red Wire to +5V Black Wire to Digital Input 4.7 kOhm resistor from Digital Input to GND Out of water the sensor reported a digital low (0) and in the presence of water the sensor reported a digital high (1).

#7 Guest_Guest_*

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Posted 20 September 2005 - 01:21 AM

Many thanks for that. I expect you could use the analog channels, if you needed to?

#8 LabJack Support

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Posted 20 September 2005 - 05:36 AM

Sure. You should be able to connect to an analog input and read about 5 volts (water) or 0 volts (no water).

#9 LabJack Support

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Posted 09 October 2013 - 07:37 AM

Updated links from above:

 

George Risk Industries 2800 Water Sensor Switch (GRI 2800)

http://www.amazon.co...d/dp/B000GUTZR8

 

Hobby Boards Leaf Wetness Sensor

http://www.hobby-boa...ess-Sensor.html

 

 

More sensors:

 

Control Products WS-600 Water Sensor

http://www.amazon.co...r/dp/B0058RVN4M

 

Floodstop Water Sensor XS-01

http://www.amazon.co...r/dp/B000BPC3Z4

 

RioRand Water Sensor

http://www.amazon.co...e/dp/B00EW5LF1W

 

Phantom YoYo Water Sensor

http://www.amazon.co...r/dp/B00A1AEJ9M

 

Flood Detective Pro Water Sensor

http://www.amazon.co...r/dp/B003ZJO43M

 

 

We only tested the GRI 2800, but any of these should work.  Whichever one you get, use a simple DMM to measure the resistance when dry, slightly wet, and totally wet, and from those values we can help get it connected.

 

These all use conductivity of the water, moisture, or other liquid, to cause a change in resistance.  The resistance is infinite or very high when dry, and drops due to the conductivity of the liquid.  Thus pure distilled water in theory would not be detectable, until it has picked up some impurities.



#10 Motorbhoy

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Posted 10 October 2013 - 02:31 AM

Hi,

 

I'm in the UK and struggling to find one of the above from an Industrial supplier.

 

Would this work with the U3: http://uk.rs-online....itches/7761604/

 

thanks



#11 LabJack Support

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Posted 10 October 2013 - 10:23 AM

I can't get enough information from the datasheet to tell what that sensor is or does, so I am not sure.

 

I did look at Amazon.co.uk and found some likely sensors:

 

http://www.amazon.co...r/dp/B00FQAQ9BI

 

http://www.amazon.co...r/dp/B00DVM4MPS



#12 Motorbhoy

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Posted 11 October 2013 - 06:45 AM

Thanks for that.



#13 Motorbhoy

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Posted 13 November 2013 - 05:10 AM

Hi,

 

I ended up buying these:

 

http://www.amazon.co...r/dp/B00DVM4MPS

 

Can a few of these be wired in series?

 

Can you tell me how I should wire them?  They have 3 terminals, '+', '-' & 'S'

 

thanks



#14 LabJack Support

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Posted 13 November 2013 - 09:41 AM

Connect VS (~5 volts) to the + lead and GND to the - lead.  Then use a DMM to check the voltage on the S lead when the device is dry versus wet.  Let us know what you see, but presumably this will change.

 

Also, for a better understanding of the sensor, use the DMM to take 3 resistance measurements with no other connections to the sensor besides the DMM.  Measure from + to -, + to S, and S to -.  Let us know what you get for these.

 

Series does not make sense to me, but you can wire a bunch in parallel.  Connect VS to the + lead on all and connect GND to the - lead on all.  The connect the S leads to different analog or digital inputs, depending on what you find from the above test.



#15 Motorbhoy

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Posted 15 November 2013 - 02:33 AM

Thanks.  I'll report back on how I get on.  Might be next week now.

 

cheers.



#16 Motorbhoy

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Posted 20 November 2013 - 08:21 AM

Hi,

 

I got this working.  Thanks for your help.

 

When dry, between 'S' & '-' the voltage is 0v.  When It gets wet it rises to 3.2V approx.

 

I fed 'S' into an analogue channel on the U3 and was able to use it as a trigger in a sequence. 

 

Thanks again for taking the time to reply.




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